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半导体制程基本知识 .pdf 480Kb 2011/8/31 0:00:00 微机电制作技术,尤其是最大宗以硅半导体为基础的微细加工技术(silicon- based micromachining),原本就肇源于半导体组件的制程技术,所以必须先介绍清楚这类制程 点击下载
常用原理图元件符号 .pdf 534Kb 2011/8/31 0:00:00 常用原理图元件符号 RES1 RES2 RES3 RES4 VARISTOR ELECTRO1 ELECTRO2 CAP CAPVAR CAPACITOR CAPACITOR POL INDUCTOR-INDUCTOR VARIABLE IRON INDUCTOR-INDUCTOR VARIABLE IRON INDUCTOR-INDUCTOR VARIABLE IRON DIODE DIODE SCHOTTKY DIODE TUNNEL DIODE VARACTOR ZENER1 ZENER2 ZENER3 BATTERY NPN PNP NPN1 PNP1 NPN DAR PNP DAR NPN DIAC PNP DIAC NPN-PHOTO PNP-PHOTO PHOTO NPN ANTENNA AND OR BUFFER XOR SOURCE CURRENT NAND NOR NOT XNOR SOURCE VOLTAGE POT1 POT2 RESISTOR TAPPED FUSE1 FUSE2 LED PHOTO PLUGSOCKET THERMAL FUSE TRANZORB LAMP 点击下载
TEC1系列致冷元件使用中注意问题 .pdf 281Kb 2011/8/31 0:00:00 当採用非专用设备检验该器件时,在工作参数下,热端的温度必须低于80℃,(含改变电流方向冷端变成热端)。在热端没有散热条件下,瞬间通电进行试验,即用手触摸致冷器的两个端面,感到有一定的热感,一面稍有冷感即可。否则由于热端温度太高,极易造成器件短路或断览使致冷器报废。 点击下载
采用NTC热敏电阻做温度采集 .pdf 417Kb 2011/8/31 0:00:00 本应用例实现NTC热敏电阻器对温度的测量。热敏电阻器把温度的变化转换为电阻阻值的变化,再应用相应的测量电路把阻值的变化转换为电压的变化;SPMC75F2413A内建8路ADC可以把模拟的电压值转换为数字信号,对数值信号进行处理可以得到相应的温度值。 点击下载
采用霍尔元件的测速电路 .pdf 116Kb 2011/8/31 0:00:00 测速是工农业生产中经常遇到的问题,学会使用单片机技术设计测速仪表具有很重要的意义。要测速,首先要解决是采样的问题。在使用模拟技术制作测速表时,常用测速发电机的方法,即将测速发电机的转轴与待测轴相连,测速发电机的电压高低反映了转速的高低。使用单片机进行测速,可以使用简单的脉冲计数法。只要转轴每旋转一周,产生一个或固定的多个脉冲,并将脉冲送入单片机中进行计数,即可获得转速的信息。 下面以常见的玩具电机作为测速对象,用CS3020设计信号获取电路,通过电压比较器实现计数脉冲的输出,既可在单片机实验箱进行转速测量,也可直接将输出接到频率计或脉冲计数器,得到单位时间内的脉冲数,进行换算即可得电机转速。这样可少用硬件,不需编程,但仅是对霍尔传感器测速应用的验证。 点击下载
单回路PID控制器原理及应用 .pdf 243Kb 2011/8/31 0:00:00 主要应用 工业机械制造 电气窑炉 塑胶机械 印染机械 科研仪器 点击下载
各种震荡电路设计教材 .rar 422Kb 2011/8/31 0:00:00 正弦波发生电路能产生正弦波输出,它是在放大电路的基础上加上正反馈而形成的,它是各类波形发生器和信号源的核心电路。正弦波发生电路也称为正弦波振荡电路或正弦波振荡器。   9.1.1 产生正弦波的条件   9.1.2 RC正弦波振荡电路   9.1.3 LC正弦波振荡电路   产生正弦波的条件与负反馈放大电路产生自激的条件十分类似。只不过负反馈放大电路中是由于信号频率达到了通频带的两端,产生了足够的附加相移,从而使负反馈变成了正反馈。在振荡电路中加的就是正反馈,振荡建立后只是一种频率的信号,无所谓附加相移 点击下载
各种震荡电路设计教材 .rar 422Kb 2011/8/31 0:00:00 正弦波发生电路能产生正弦波输出,它是在放大电路的基础上加上正反馈而形成的,它是各类波形发生器和信号源的核心电路。正弦波发生电路也称为正弦波振荡电路或正弦波振荡器。   9.1.1 产生正弦波的条件   9.1.2 RC正弦波振荡电路   9.1.3 LC正弦波振荡电路   产生正弦波的条件与负反馈放大电路产生自激的条件十分类似。只不过负反馈放大电路中是由于信号频率达到了通频带的两端,产生了足够的附加相移,从而使负反馈变成了正反馈。在振荡电路中加的就是正反馈,振荡建立后只是一种频率的信号,无所谓附加相移 点击下载
各种震荡电路设计教材 .rar 422Kb 2011/8/31 0:00:00 正弦波发生电路能产生正弦波输出,它是在放大电路的基础上加上正反馈而形成的,它是各类波形发生器和信号源的核心电路。正弦波发生电路也称为正弦波振荡电路或正弦波振荡器。   9.1.1 产生正弦波的条件   9.1.2 RC正弦波振荡电路   9.1.3 LC正弦波振荡电路   产生正弦波的条件与负反馈放大电路产生自激的条件十分类似。只不过负反馈放大电路中是由于信号频率达到了通频带的两端,产生了足够的附加相移,从而使负反馈变成了正反馈。在振荡电路中加的就是正反馈,振荡建立后只是一种频率的信号,无所谓附加相移 点击下载
用KMZ51和KMZ52设计电子指南针 .pdf 308Kb 2011/8/29 0:00:00 The KMZ51 and KMZ52 from Philips Semiconductors are magnetic field sensors, dedicated to compass applications. Both sensors rely on the magnetoresistive effect and provide the required sensitivity and linearity to measure the weak magnetic field of the earth. While the KMZ51 is a single axis field sensor, the KMZ52 comprises a two-dimensional field sensor, as it is required for a compass, within one package. Both devices are equipped with integrated set/reset and compensation coils. These coils allow to apply the flipping technique for offset cancellation and the electro-magnetic feedback technique for elimination of the sensitivity drift with temperature. 点击下载
使用传感器KMZ41和传感器信号调节芯片UZZ9001 .pdf 817Kb 2011/8/29 0:00:00 Angle measurement is frequently required in both automotive and industrial applications. Contactless methods have the advantage that they are free of wear. If a magnetic field acts as the transmitter between the physical value to be measured and the actual sensor, the magnetic system and the signal conditioning electronics can be encapsulated separately making such systems robust against dirt, dust and liquid as well as mechanical destruction. Among this class of measurement systems, those using the magnetoresistive effect (MR effect) are characterised by the additional feature that they evaluate the direction of the magnetic field and not the field strength. Therefore MR based systems tolerate variations in field strength caused by ageing or temperaturesensitivity of the magnet as well as mechanical tolerances. This recommends MR based systems for applications where robust, precise, and also cost-efficient solutions are required. 点击下载
时钟芯片DS1302及其在数据记录中的应用 .doc 41Kb 2011/8/29 0:00:00 时钟芯片DS1302及其在数据记录中的应用:介绍了美国DALLAS公司推出的低功耗时钟芯片DS1302的结构和工作原理及其在测量系统中的应用。它可以对年、月、日、周日、时、分、秒进行计时,且具有闰年补偿等多种功能。DS1302用于数据记录,特别是对某些具有特殊意义的数据点的记录上,能实现数据与出现该数据的时间同时记录。这种记录对长时间的连续测控系统结果的分析以及对异常数据出现的原因的查找有重要意义。 关键词: 数据记录 时钟芯片DS1302 硬件电路 软件设计 在测量控制系统中,特别是长时间无人职守的测控系统中,经常需要记录某些具有特殊意义的数据及其出现的时间。记录及分析这些特殊意义的数据,对测控系统的性能分析及正常运行具有重要的意义。传统的数据记录方式是隔时采样或定时采样,没有具体的时间记录,因此只能记录数据而无法准确记录其出现的时间;若采用单片机计时,一方面需要采用计数器,占用硬件资源,另一方面需要设置中断、查询等,同样耗费单片机的资源,而且某些测控系统可能不允许。而在系统中采用DS1302则能很好地解决这个问题。 点击下载
NE564的应用电路描述 .pdf 181Kb 2011/8/29 0:00:00 The NE564 contains the functional blocks shown in Figure 1. In addition to the normal PLL functions of phase comparator, VCO, amplifier and low-pass filter, the NE564 has internal circuitry for an input signal limiter, a DC retriever, and a Schmitt trigger. The complete circuit for the NE564 is shown in Figure 1. 点击下载
带晶体控制的锁相环压控振荡器的时钟再生器 .pdf 171Kb 2011/8/29 0:00:00 In order to obtain a local clock signal in Multiplexed Data Transmission systems, a phase and frequency coherent method of signal extraction is required. A Master-Slave system using the quartz crystal as the primary frequency determining element in a phase-lock loop VCO is used to reproduce a phase coherent clock from an asynchronous Data Stream. 点击下载
同步FIFO存储器深度扩展的两种方法 .pdf 817Kb 2011/8/29 0:00:00 Applications often require FIFO buffers deeper than those offered by discrete devices. By depth expanding multiple devices,a logically deeper FIFO can be constructed. The synchronous FIFO family offers two approaches to this common application. The CY7C42x5 family of x18 devices contain an on-chip expansion circuit, allowing very simple cascading.The CY7C42x1 family of x9 FIFOs take a very different approach since the on-chip expansion logic is not available. Both approaches will be discussed in detail, examining the advantages and disadvantages of each. 点击下载
三极管系列型号、极性、管脚、功能及参数 .pdf 245Kb 2011/8/29 0:00:00 三极管系列型号、极性、管脚、功能及参数 品 名 极性管脚功 能 参 数 MPSA42 NPN 21E 电话视频放大300V0.5A0.625W MPSA92 PNP 21E 电话视频放大300V0.5A0.625W MPS2222A NPN 21 高频放大75V0.6A0.625W300MHZ 9011 NPN EBC 高频放大50V30mA0.4W150MHz 9012 PNP 贴片低频放大50V0.5A0.625W 9013 NPN EBC 低频放大50V0.5A0.625W 9013 NPN 贴片低频放大50V0.5A0.625W 9014 NPN EBC 低噪放大 50V0.1A0.4W150MHZ 9015 PNP EBC 低噪放大 50V0.1A0.4W150MHZ 9018 NPN EBC 高频放大30V50MA0.4W1GHZ 8050 NPN EBC 高频放大40V1.5A1W100MHZ 8550 PNP EBC 高频放大40V1.5A1W100MHZ 2N2222 NPN 4A 高频放大60V0.8A0.5W25/200NSβ=45 2N2222A NPN 小铁高频放大75V0.6A0.625W300MHZ 2N2369 NPN 4A 开关 40V0.5A0.3W800MHZ 2N2907 NPN 4A 通用 60V0.6A0.4W26/70NSβ=200 2N3055 NPN 12 功率放大 100V15A115W 2N3440 NPN 6 视放开关 450V1A1W15MHZ 2N3773 NPN 12 音频功放开关160V16A150W COP 2N6609 2N3904 NPN 21E 通用 60V0.2Aβ=100-400 2N3906 PNP 21E 通用 40V0.2Aβ=100-400 2N5401 PNP 21E 视频放大160V0.6A0.625W100MHZ 2N5551 NPN 21E 视频放大160V0.6A0.625W100MHZ 2N5685 NPN 12 音频功放开关60V50A300W 2N6277 NPN 12 功放 开关 180V50A250W 2N6609 PNP 12 音频功放开关160V15A150W COP 2N3773 2N6678 NPN 12 音频功放开关650V15A175W15MHZ 2N6718 NPN 小铁音频功放开关100V2A2W50MHZ 3DA87A NPN 6 视频放大100V0.1A1W 3DG6A NPN 6 通用 15V20mA0.1W100MHz 3DG6B NPN 6 通用 20V20mA0.1W150MHz 3DG6C NPN 6 通用 20V20mA0.1W250MHz 3DG6D NPN 6 通用 30V20mA0.1W150MHz 3DG12C NPN 7 通用 45V0.3A0.7W200MHz 3DK2B NPN 7 开关 30V30mA0.2W 3DK4B NPN 7 开关 40V0.8A0.7W 3DK7C NPN 7 开关 25V50mA0.3W 3DD15D NPN 12 电源开关300V5A50W 3DD102C NPN 12 电源开关300V5A50W 3522V 5.2V稳压管录像机用 A634 PNP 28E 音频功放开关40V2A10W A708 PNP 6 NF/S 80V0.7A0.8W A715C PNP 29 音频功放开关35V2.5A10W160MHZ A733 PNP 21 通用 50V0.1A180MHZ A741 PNP 4 S 20V0.1A <70/120nS A781 PNP 39B 开关 20V0.2A <80/160NS A928 PNP ECB 通用 20V1A0.25W A933 PNP 21 Uni 50V0.1A140MHz A940 PNP 28 音频功放开关150V1.5A25W4MHZ /C2073 A950 PNP 21 通用 30V0.8A0.6W A966 PNP 21 音频激励输出30V1.5A0.9W COP:C2236 A968 PNP 28 音频功放开关160V1.5A25W100MHZ /C2238 A1009 PNP BCE 功放开关350V2A15W A1012 PNP 28 音频功率放60V5A25W A1013 PNP 21 视频放大160V1A0.9W A1015 PNP 21 通用 60V0.15A0.4W8MHZ A1020 PNP 21 音频开关 50V2A0.9W A1123 PNP 21 低噪放大 150V0.05A0.75W A1162 PNP 21d 通用 贴片50V0.15A0.15W A1216 PNP BCE 功放 开关 180V17A200W20MHZ /2922 A1220 PNP 29 音频功放开关120V1.5A20W150MHZ/C2690 A1265 PNP BCE 功放 开关 140V10A100W30MHZ /C3182 A1295 PNP BCE 功放 开关 230V17A200W30MHZ /C3264 A1301 PNP BCE 功放 开关 160V10A100W30MHZ /C3280 A1302 PNP BCE 功放 开关 200V15A150W30MHZ /C3281 A1358 ? PNP 高频120V1A10W120MHZ A1444 PNP BCE 高速电源开关100V15A30W80MHZ A1494 PNP BCE 功放 开关 200V17A200W20MHZ /C3858 A1516 PNP BCE 功放 开关 180V12A130W25MHZ A1668 PNP 28B 电源开关 200V2A25W20MHZ A1785 PNP BCE 驱动 400V1A1W/120V1A0.9W140MH A1941 PNP BCE 功放开关140V10A100WCOP:5198 A1943 PNP BCE 功放 开关 230V15A150W /C5200 原 A1988 PNP 30 功放 开关 B449 PNP 12 功放开关50V3.5A22.5W 锗管 B631K PNP 29 音频功放开关120V1A8W130MHZ /D600K B647 PNP 21 通用 120V1A0.9W140MHZ /D667 B649 PNP 29 视放180V1.5A1W /D669 B669 PNP 28 达林顿功放 70V4A40W B673 PNP 28 达林顿功放 100V7A40W B675 PNP 28 达林顿功放 60V7A40W B688 PNP BCE 音频功放开关120V8A80W /D718 B734 PNP 39B 通用 60V1A1W /D774 B744 PNP 21 通用 30V0.1A0.25W B772 PNP 29 音频功放开关40V3A10W B774 PNP 21 通用 30V0.1A0.25W B817 PNP 30 功放开关160V12A100W /D1047 B834 PNP 28 功放开关60V3A30W B937A PNP 功放开关60V2A35 DRAL B1020 PNP 28 功放开关达林顿100V7A40Wβ=6000 B1079 PNP 30 达林顿功放100V20A100Wβ=5000/D1559 B1185 PNP 28B 功放开关60V3A25W 70MHZ /D1762 B1238 PNP ECB 功放开关80V0.7A1W 100MHZ B1240 PNP 39B 功放开关40V2A1W100HZ B1243 PNP 39B 功放开关40V3A1W70HZ B1316 PNP 54B 驱动功放达林顿100V2A10Wβ=15000 B1317 PNP BCE 音频功放180V15A150W COP:D1975 B1335 PNP 28 音频功放低噪80V4A30W 12MHZ B1375 PNP BCE 音频功放60V3A2W9MHZ B1400 PNP 28B 达林顿功放120V6A25W β=1000-20000 B1429 PNP BCE 功放开关180V15A150W B1494 PNP BCE 达林顿功放120V25A120Wβ=2000-20000 C106 NPN EBC 音频功放开关60V1.5A15W C380 NPN 21 高频放大35V0.03A250MHZ C458 NPN 21 通用 30V0.1A230MHz C536 NPN 21 通用 40V0.1A180MHZ C752 NPN 21 通用 30V0.1A300MHz C815 NPN 21 通用 60V0.2A0.25W C828 NPN 21 通用 45V0.05A0.25W C900 NPN 21 低噪放大 30V0.03A100MHZ C943 NPN 4A 通用 60V0.2A200MHZ C945 NPN 21 通用 50V0.1A0.5W250MHZ C1008 NPN 6 通用 80V0.7A0.8W50MHZ C1162 NPN 29 音频功放开关35V1.5A10W C1213 NPN 39B 监视器专用35V0.5A0.4W C1222 NPN 21 低噪放大 60V0.1A100MHZ 点击下载
以DS1820为例,介绍温度控制演示板的性能,电路 .pdf 514Kb 2011/8/29 0:00:00 • Direct–to–digital, direct–to–PC instrumentation with graphical user interface demo • Ready to use temperature control demonstration including piezo–sensor for sensing of mechanical activity and LED to simulate opto–isolators • Features minimalist sensor chips and 1–Wire line–powered MicroLANTM networking technique • Self–configuring TMEX–based software automatically identifies devices and assigns communication port • Includes DS1820 1–Wire Thermometer and DS2407 Addressable Switch as a Sensor/Actuator 点击下载
选择处理器复位IC .pdf 260Kb 2011/8/29 0:00:00 Microcontroller and microprocessor based systems rely on processor supervisory functions to insure stable operation. The most basic of all these functions is managing the processor reset input.To ensure stable operation, the processor must be held in reset any time supply voltage is out-of-tolerance. Once supply voltage is in-tolerance, the processor must be maintained in reset for an additional time period to ensure a stable start-up. The processor reset function may be contained on-board the processor itself, or may be externally implemented using discrete components or a supervisor IC. 点击下载
在应用中如何最好地运用数字可编程延迟发生器 .pdf 76Kb 2011/8/29 0:00:00 The AD9500 and AD9501 digitally programmable delay generators are versatile parts, useful in numerous applications.The parts are designed for use in automatic test equipment as a deskew element for digital data lines. The versatility of the AD9500 and AD9501 for generating programmable delays allows them to be used in applications that range from ATE to communications, computers,disk drives, lasers and ultrasound systems. This note describes how best to apply these parts in some of these applications. 点击下载
组合运算放大器和缓冲器BUF634,以得到更大输出功 .pdf 78Kb 2011/8/29 0:00:00 As long as amplifiers have existed, engineers have been dreaming of an “ideal” op amp. As little noise as possible,high bandwidth, great precision, unlimited input impedance,and output impedance close to 0W—these are specifications desirable for every application. Unfortunately, no op amp can fulfill all of these requirements, particularly not while remaining affordable. A good solution, therefore, is to combine two components, using the best of both parts to achieve desired specifications. 点击下载
低压电容器特性 .pdf 154Kb 2011/8/29 0:00:00 Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. 点击下载
选择恰当的电平转换方案 .pdf 576Kb 2011/8/29 0:00:00 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Dual-Supply Level Translators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Product Portfolio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Open-Drain Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 Application Example − Level Translation Using the SN74LVC2G07 . . . . . . . . . . . . . . . . . . . . . . 9 3.2 Do Not Use Pullup Resistors at Outputs of CMOS Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 FET Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.1 CBT and CBTD Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Using Translation Voltage Clamp (TVC) Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 Overvoltage-Tolerant Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6 Devices With TTL-Compatible Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7 Summary of Translation Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 9 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 点击下载
CMOS功耗与功耗电容量计算 .pdf 117Kb 2011/8/29 0:00:00 Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current 点击下载
阻容复位器和监控器复位脉冲比较 .pdf 100Kb 2011/8/29 0:00:00 阻容复位器和监控器复位脉冲比较: 点击下载
数控电位器入门 .pdf 70Kb 2011/8/29 0:00:00 There are two types of potentiometers; mechanical and electronic. The terminals of the mechanical potentiometer are called CW (clockwise), CCW (counter clockwise), and wiper. The corresponding names or designations for the terminals of the electronic version are VH or RH, VL or RL,and the wiper VW or RW. The mechanical pot is a three terminal device while the electronic pot is an integrated circuit with a minimum of eight terminals. 点击下载
RLD-78系列激光二极管及其应用 .pdf 147Kb 2011/8/26 0:00:00 RLD-78系列激光二极管及其应用 点击下载
使用Greenline功率因数控制器MC33260设计功率因 .pdf 262Kb 2011/8/26 0:00:00 The MC33260 is an active power factor controller that functions as a boost pre–converter which, meeting international standard requirement in electronic ballast and off–line power supply application. MC33260 is designed to drive a free running frequency discontinuous mode, it can also be synchronized and in any case, it features very effective protections that ensure a safe and reliable operation. This circuit is also optimized to offer extremely compact and cost effective PFC solutions. It does not entail the need of auxiliary winding for zero current detection hence a simple coil can be used instead of a transformer if the MC33260 Vcc is drawn from the load (please refer to page 19 of the data sheet). While it requires a minimum number of external components, the MC33260 can control the follower boost operation that is an innovative mode allowing a drastic size reduction of both the inductor and the power switch. Ultimately, the solution system cost is significantly lowered. Also able to function in a traditional way (constant output voltage regulation level), any intermediary solutions can be easily implemented. This flexibility makes it ideal to optimally cope with a wide range of applications. This application note will discuss on the design of power factor correction circuit with MC33260 with traditional boost constant output voltage regulation level operation and follower boost variable output voltage regulation level operation. For derivation of the design equations related to the IC please refer to MC33260 data sheet. 点击下载
光电二极管与放大器集成器件OPT301 .pdf 99Kb 2011/8/26 0:00:00 许多测量电路都要用到光电检测电路,而光电二极管和运算放大器常常是其必要的组成部分,但分立式设计普遍存在着漏电流误差、混入噪声和杂散电容引起的增益尖峰等难以克服的缺点,OPT301由于将光电二极管和放大器集成于同一块芯片上,因而可最大程度消除这些不利因素,文中介绍了OPT301的工作原理、技术指标及常用的应用电路。 点击下载
如何用HIP4082设计一个独立电池DC-DC转换器 .pdf 267Kb 2011/8/26 0:00:00 如何用HIP4082设计一个独立电池DC-DC转换器:The advent of the personal computer (PC), has created the need for uninterruptible power supplies to insulate computers from line dips and temporary outages that plague PC reliability. In addition, numerous other applications exist for DC to AC inverters including small tools or accessories from a DC battery source in automobiles. There is a need, too, for providing battery backup in the telephone industry for 20Hz ring generators. The HIP4082 DC/AC Evaluation Board (subsequently referred to as the “eval-board”) featuring the HIP4082 is one way to increase the performance, while reducing cost of DC to AC conversion. The topology chosen uses the HIP4082 to provide a 60kHz, low voltage, square-wave to drive a small isolation power transformer. The output of this transformer is rectified, filtered, and the high voltage inverted again to produce the desired low frequency (55Hz) output waveform. (55Hz was chosen as a compromise between the 50Hz and 60Hz power standards.) A variable duty-cycle quasi-squarewave output waveform was chosen over a sinusoidal waveform for simplicity and cost-effectiveness. The 60kHz frequency of the primary-side inverter minimizes cost and size of the transformer, while the square-wave output waveform minimizes the size of the secondary-side rectifier filter. 点击下载
如何预先分配XC9500系列 CPLD器件的引脚 .pdf 95Kb 2011/8/26 0:00:00 Reducing time to market is critical in today’s highly competitive marketplace, and designers often need to prototype their products as swiftly as possible. Because PC board production is often the slowest part of the development process, it is often advantageous to begin PC board layout before the CPLD designs are complete. This requires designers to preassign device pins. 点击下载